Mummified Sphinx

When this creature enters the battlefield, exile
two target creatures controlled by different
opponents until beginning of the next upkeep.
Put an aegis counter on those creatures.
When creatures exiled this way return to the
battlefield, they gain "When this creature enters
the battlefield, exile two target creatures with no
aegis counters controlled by different opponents
until beginning of the next upkeep. Put an aegis
counter on those creatures."